Imagettftext - 行间距不正确

Question

I have an problem with PHP function imagettftext. I have code for generating card images from database with text informations. And with some cards I have problem - words are written over each other (like here).

My code looks like this (font size changes depending on the length of the text)

            $length = strlen($cardInfo->description);
            if ($length < 15) {
                $divide = 15;
                $fontSize = 16;
                $lineHeight = 25;
                $startPos = 220;
            } else if ($length < 70) {
                $divide = 25;
                $fontSize = 12;
                $lineHeight = 18;
                $startPos = 210;
            } else if ($length < 110) {
                $divide = 28;
                $fontSize = 10;
                $lineHeight = 14;
                $startPos = 210;
            } else {
                $divide = 38;
                $fontSize = 8;
                $lineHeight = 13;
                $startPos = 210;
            }
            $description = wordwrap($cardInfo->description, $divide, ">>>");
            $lines = explode(">>>", $description);
            $count = 0;
            foreach ($lines as $line) {
                $position = $count * $lineHeight;
                $count++;
                imagettftext($image, $fontSize, 0, 28, ($startPos + $position), $black, $font, $line);
            }

and the text in the database looks like this:

Oblehací stroj

Imunita vůči střelám /Tato jednotka je imunní vůči střeleckým zraněním/

Other problem is with the line wrapping: here. I don't know why the word "jídlo" is on the next line.

Thank you for any answers!

Answer 1

Long time ago, I have written a quite complex class to archive a similar task.

I don't have this code anymore, but the steps are fairly simple.

First: Don't rely on the calculations, php does on rare fonts.

Php's wordwrap-function is senseless here, because you deal with a charset-width (e.g. tracking) unknown to php. Wordwrap assumes, that all characters have the same char-width.

So, you have to build your own wordwrap-function using imagettfbbox. Then, you'll have to determine the size of the lowercase "x"-letter and the uppercase "X"-letter. These letters are the norm to calculate your own line-height/line-spacing. I also recommend you to manually separate words, since PHP does not always recognize the white-space-width correctly.

Hope this could help you...